Earthquake with magnitude of ML 1.1 on date 17-10-2021 and time 13:30:47 (Italy) in region 4 km N Spoleto (PG)

A magnitude ML 1.1 earthquake occured in region: 4 km N Spoleto (PG), on

  • 17-10-2021 11:30:47 (UTC)
  • 17-10-2021 13:30:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.769, 12.752 at 11 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Spoleto PG 4 38218 38218
Campello sul Clitunno PG 6 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Castel Ritaldi PG 9 3278 44502
Scheggino PG 9 461 44963
Vallo di Nera PG 9 364 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 15 1075 54871
Giano dell'Umbria PG 16 3846 58717
Montefalco PG 16 5679 64396
Poggiodomo PG 16 117 64513
Ferentillo TR 17 1913 66426
Massa Martana PG 19 3770 70196
Acquasparta TR 19 4778 74974
Montefranco TR 19 1276 76250
Sellano PG 20 1079 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km S of Foligno (57155 inhabitants)
25 Km NE of Terni (111501 inhabitants)
48 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
85 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 inhabitants)
100 Km N of Roma (2864731 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2021-10-17
11:30:47
42.7693 12.7515 11 2021-10-17
11:42:50
Sala Sismica INGV-Roma 96679031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 11:30:47 ± 0.05
Latitude 42.7693 ± 0.0036
Longitude 12.7515 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96679031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 358
Semi-minor axis of confidence ellipse (meter) 300
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 188
Circular confidence region, given by single value of horizontal uncertainty (meter) 360
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.1304
Epicentral distance of station farthest from the epicenter (degree) 0.46225
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 96679031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 11:42:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MC2.EHZ. 2021-10-17T11:31:00.67 0.3 undecidable manual S 66 0.3507 50 0.52 65
IV.NRCA.HHZ. 2021-10-17T11:30:57.71 0.3 undecidable manual S 76 0.2734 50 -0.16 71
IV.LNSS.HHZ. 2021-10-17T11:30:57.80 0.3 undecidable manual S 128 0.2698 50 0.04 73
IV.CESI.HNZ. 2021-10-17T11:30:57.46 0.3 undecidable manual S 25 0.2608 50 -0.03 73
IV.CSP1.EHZ. 2021-10-17T11:30:56.63 0.3 undecidable manual P 46 0.4623 50 0.01 71
IV.MML1.EHZ. 2021-10-17T11:30:55.30 0.6 undecidable manual P 25 0.3795 50 0.1 47
IV.CESX.HHE. 2021-10-17T11:30:55.69 0.3 undecidable manual S 217 0.2014 50 -0.04 74
IV.ARRO.EHE. 2021-10-17T11:30:55.52 0.3 undecidable manual S 177 0.1907 50 0.11 73
IV.RM33.EHZ. 2021-10-17T11:30:55.96 0.3 undecidable manual P 127 0.4281 50 -0.07 70
IV.MC2.EHZ. 2021-10-17T11:30:54.73 0.3 undecidable manual P 66 0.3507 50 0.03 72
IV.FDMO.HHZ. 2021-10-17T11:30:54.84 0.3 undecidable manual P 43 0.3624 50 -0.07 71
IV.MOMA.HHZ. 2021-10-17T11:30:53.66 0.3 undecidable manual S 285 0.1376 125 -0.08 74
IV.NRCA.HHZ. 2021-10-17T11:30:53.16 0.3 undecidable manual P 76 0.2734 50 -0.22 70
IV.LNSS.HHZ. 2021-10-17T11:30:53.21 0.3 undecidable manual P 128 0.2698 50 -0.1 72
IV.CESI.HNZ. 2021-10-17T11:30:53.06 0.3 undecidable manual P 25 0.2608 50 -0.1 72
IV.GAVE.EHZ. 2021-10-17T11:30:53.61 0.3 undecidable manual S 126 0.1304 127 0.1 74
IT.GNU.HGZ. 2021-10-17T11:30:53.91 0.3 undecidable manual S 285 0.1376 125 0.17 73
IV.CESX.HHE. 2021-10-17T11:30:52.66 0.3 undecidable manual P 217 0.2014 50 0.51 67
IV.ARRO.EHE. 2021-10-17T11:30:51.45 0.3 undecidable manual P 177 0.1907 50 -0.51 67
IV.GAVE.EHZ. 2021-10-17T11:30:50.89 0.3 undecidable manual P 126 0.1304 127 0.03 75
IT.GNU.HGZ. 2021-10-17T11:30:50.91 0.3 undecidable manual P 285 0.1376 125 -0.08 74
IV.MOMA.HHZ. 2021-10-17T11:30:50.96 0.1 undecidable manual P 285 0.1376 125 -0.04 100
IV.ASSB.HHZ. 2021-10-17T11:30:47.77 0.3 undecidable manual P 0.2815 -5.75 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.1 0.0001105 1.14 AML other m 2021-10-17T11:30:53.78
IV.MOMA.HHE. ML:1.4 0.000261 0.18 AML other m 2021-10-17T11:30:54.12
IV.MOMA.HHN. ML:1.1 0.00010645 0.6 AML other m 2021-10-17T11:30:54.63
IV.GAVE.EHE. ML:1.1 0.000131 0.76 AML other m 2021-10-17T11:30:55.26
IV.LNSS.HHE. ML:1.1 6.375E-5 0.28 AML other m 2021-10-17T11:30:58.52
IV.NRCA.HHN. ML:1 4.415E-5 0.78 AML other m 2021-10-17T11:30:58.95
IV.LNSS.HHN. ML:1.1 5.365E-5 0.42 AML other m 2021-10-17T11:30:59.38
IV.NRCA.HHE. ML:1 4.665E-5 0.32 AML other m 2021-10-17T11:31:00.20
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download